Tom a Lincoln
A Niayesh (p. 55) points out, here Prester John has become emptied of any of the significations that marked his identity for the previous five centuries:
Nothing in the play lends any specificity to his realm, where the character and his daughter simply appear as types of the angry father and disobedient daughter. No reference is made here to Prester John's being a Christian; in fact, he actually swears by 'the gods' (l. 2529) like a true pagan. The geographical whereabouts of his land are in no way detailed, leaving us only to infer that he is neither Indian... nor Ethiopian.
Brooks (p. 233) includes an excerpt from a 1630 edition of Tom a Lincoln, published in London.